<?php
abstract class DB_Core
{ 
	protected $link;
	abstract public function connect();
	abstract public function select_db($db);
	abstract public function error(); 
	abstract public function errno();
	abstract public function query($query);
	abstract public function fetch_array($result);
	abstract public function fetch_row($result);
	abstract public function fetch_assoc($result);
	abstract public function fetch_object($result);
	abstract public function num_rows($result);
	abstract public function close();
} 
?>
